Process of producing multicolored effects in spun and woven goods.



IINI

rNr re.

MAX BECKE, or HooHsr-oN-THE-MAIN,

GERMANY, ASSIGNOR TO FARBWERKE VORM.

'IION 0F GERMANY.

PROCESS OF PRODUCING MULTICOLORED EFFECTS IN SPUN AND WOVEN GOODS.

No Drawing.

Specification of Letters Patent.

Patented Aug. 29, 1911.

To all whom it may concern:

Be it known that I, MAX Bnoxn, engineerchemist, a citizen of the Empire of Germany, residing at H6chst-on-the-Main, Germany, have invented certain new and useful Improvements in Processes of Producing Multicolored Effects in Spun and Woven Goods, of which the following is a specification.

In U. S. Patent No. 815,671 is described a process for modifying the atfinity of wool fiber for dyestuffs in such a manner that multi-colored effects of any kind can be obtained in dyeing fabrics composed entirely or partly of wool. Hitherto no analogous process for producing such effects on vegetable fiber has been known. Now I have found that similar white or colored effects can be produced in dyeing cotton and other vegetable material by applying, on the one hand, the oxidizing action of the higher oxids of manganese upon certain dyestuffs, and on the other hand, the stability of certain cotton dyestuffs to this oxidizing action.

According to the new method the procedure is as follows: The cotton (loose cotton, laps, yarns or twisted yarn) to be rendered capable of resisting dye is prepared with higher oxids of manganese. For this purpose it is impregnated with a concentrated solution of a salt of peroxid of manganese, for example manganous chlorid. It is then treated with a strongly-alkaline solution, for example one of caustic soda. or ammonia, whereby a manganese hydroxid is precipitated on the fiber. An active oxidizing agent such as a hypochlorite or chromate is usually added to this alkaline bath to efiect the formation of the insoluble higher oxids of manganese.

Or in lieu of such addition, the manganous' hydroxid precipitated by the alkaline solution may be transformed into the higher oxids on the fiber, by the absorption of atmospheric oxygen when drying. The essential feature of the process is the provision on the fiber of higher manganese oxids, whether the sesquioxid or the dioxid, which act in the final stage to liberate oxygen in the acid dye-bath and thereby destroy the grounddyestuf'f at the prepared spots. For the production of color effects contrasting with those of the subsequent dyeing, the cotton or other vegetable fiber must be dyed with dyestuffs which are fast to oxidizing agents (thioindigo derivatives, anthraquinone, vatdyestufi's, insoluble azo-dyestuffs or the like) before it is impregnated with the manganese salt. The white or colored vegetable fibers thus prepared with higher oxids of manga nese are used together with undyed cotton or another vegetable fiber or an animal fiber for manufacturing spun goods and woven goods. These spun goods and woven goods can, if required, be steeped, washed, boiled in the kier bleached or mercerized before the dyeing, without detriment to the action of the oxids of manganese. If the fabrics and spun goods thus prepared are then dyed, the dyestuffs used, so far as they are substantive cotton dyestuffs, are absorbed by the treated and untreated fibers. However, if the dyed material is passed through an acid bath, and if for the second dyeing the proper dyestuffs are used, the color absorbed in the second bath is removed from those parts of the fiber which are loaded with the manganese oxids, after the passage through the acid bath it is advantageous to pass the material through a bath of oxalic acid, bisulfite or the like. In this manner a fabric of any ground-color decorated with white or colored effects is obtained. For the dyeing in the second bath there can be used, among other dyestuffs, substantive cotton dyestuffs, azo dyestuffs capable of being diazotized, and indigo.

The resulting spun and woven goods having multi-colored effects are characterized by the fact that their ground-color is destroyed when treated with a hypochlorite solution of 12 Twaddle, while the multicolored eflects withstand this treatment.

The great technical advantage of the present process consists in the possibility of keeping the current patterns in stock and dyeing them any ground color, as and when required.

In calico printing the production of resist and discharge effects on indigo-dyed goods by means of the higher oxids of manganese and acids is known; however, a great number of the usual resist, discharge and printing processes cannot be applied in multi-colored dyeing. Moreover the piece dyeing of fabrics consists of vegetable fiber with colored effects, has not yet been carried out in practice, whereas this problem has already been solved as regards wool fiber in an excellent manner, according to U. S. Patent No. 815,671. The possibility of industrially producing contrast-effects of any tint in dyeing vegetable fibers in the piece was not, therefore, to be foreseen.

Having now described my invention, what I claim is:

1. The herein described process of producing multicolored effects in spun and woven goods, by precipitating on vegetable fibers manganese oxids, then Working the fibers thus treated together with untreated fibers, dyeing the goods thus manufactured, and subsequently treating the goods with agents capable of developing the oxidizing action of the manganese oxids.

2. The herein-described process of producing multi-colored effects in spun and woven goods, by precipitating on the ,,vegetable fibers dyed with dyestuffs resisting OX- 1dizing agents, manganese oxids,,then workin the fibers thus treated together with unb treated fibers, dyeing the goods thusmanufactured, and subsequently treating the goods with agents capable of developing the oxidizing action of the manganese oxids.

In testimony whereof, I affix my signature JEAN GRUN CARL GRUND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

